Revealing mistake: When Chelsea is on the roof of the house and Kathy joins her, Kathy's hair is blowing in the wind, while Chelsea's stays perfectly still, the water in the lake is also perfectly still. Obviously the director had the actors do the scenes separately until we see them both together in which case both characters hair is blowing around. (01:27:40 - 02:00:00)
Revealing mistake: When Christina Ricci picks up the silver knife off the floor in her house and her hand starts to smoke, pay attention to the shadow. You can see smoke coming from her wrist before her hand touches the knife.
Revealing mistake: When the talons and E.D.I. attack the fort during their first mission, the explosions show the use of pyrotechnics when A.T.S. missiles explode in a simple blast.
Revealing mistake: When the Mob's FBI is about to storm the house they shoot the transformer cutting power to the house. But yet when Bruce Willis shoots the fountain in the house it is still pumping out water.
Revealing mistake: When the group finds the picture of Daniel and his father Eric in the house, look closely at the photo - it was obviously very poorly patched together with photoshop. The lighting on Daniel/Eric does not match the lighting in the background at all, and it's clear that they have been crudely "cut out" of another photo and inserted over the background image. The extremely poor, obviously fake quality of the photo is even jokingly mentioned in at least one of the DVD commentaries. (01:01:05)
Revealing mistake: When Ben falls from the roof and into the leaves during the storm, you can see the mat that he lands on move from under the leaves.
Revealing mistake: After Majid commits suicide, he is breathing.
Revealing mistake: At the beginning of the movie, when the guy is bitten in the wrist, if you watch and listen closely when he shoots himself, the blood comes out of his head before he actually shoots.
Revealing mistake: When Charles Shine arrives at the bus station in the pouring rain, the background on all sides of him can be seen to be pure sunshine and dry land. It is obvious that a rain machine covering a VERY SMALL area was being used.
Revealing mistake: When Hayden is talking to the Psychiatrist in the Hospital, he is wearing some type of white powder face makeup to make him appear more "ghostly". This makeup was only applied to his face. Whenever they show a side shot of his face and neck during this scene, you can see the demarcation (line) of where the white powder face makeup ends and his natural darker tan neck begins. (01:05:20)
Revealing mistake: When Avner finds Carl dead in the hotel bed, you can see a pulse in Carl's neck.
Revealing mistake: Towards the end when Sarah and Juno team up to find the exit, they pass underneath some thin stalactites. As Sarah goes under them, one of them wobbles as if it is made of rubber. In reality stalactites are rigid formations and are not supposed to wobble when touched. (01:26:40)
Revealing mistake: Right after Darius blows the boats, Steele is on the dock firing at him. It is shown that he shoots a couple rounds but his finger is not on the trigger. (00:24:00)
Revealing mistake: After Majid commits suicide, when he is on the ground, you can CLEARLY see him breathing. I mean, it isn't even funny how much you can see him breathing.
Revealing mistake: When Ryer and Rand jump off Rand's window and down to the street, they land on a tree. Notice the severed branches; instead of being broken [presumably from the falling bodies], they are cut rather smoothly.
Revealing mistake: When Chas is being thrown up and down between the ceiling and the floor, if you look closely as Chas is falling from the ceiling to the floor and goes up again, when he goes up it's just a rewind of him falling down. (01:28:35)
Revealing mistake: During the car chase with the railway train wheels, when some of the cars get destroyed and flipped, you can see flame and smoke from the bottoms of the flipped cars where the cannons fired to flip them.
Revealing mistake: When Tessa plays a QuickTime movie, the movie's counter stays at 0:00 and the progress indicator doesn't move.
Revealing mistake: Katherine shoots Charlie twice to kill him at the end of the movie. Yet if you look at the chambers on the side of the gun, you can see all of them are empty.
Revealing mistake: When Charlie is climbing the wall you can see a handhold screwed into the wall when she lets go with her right hand. (00:59:45)